Oil Absorption Determination


BS EN ISO 787-5: BS 3483-B7

 oil absorption determination

Scope and Field of Application

BS EN ISO 787-5 and BS 3483: B7 are alternative names for the same method which is intended for the determination of the oil absorption values of pigments and extenders.

It is defined as the amount of oil required by a given weight of pigment to form a paste of specified consistency. It is affected by the particle size and surface chemistry of the pigment and consequently provides a convenient QC check for batch to batch variation in pigment properties. It is also an important value for those formulating coatings since it gives an indication of the amount of resin that will be absorbed by the pigment rather than be available for film formation.

There are no pass/fail criteria defined in the standard. This is a matter of agreement between the parties concerned.

The actual standard is a copyright-protected document and we are not able to provide you with a copy. If required however, you can easily obtain a copy from the British Standards Institution.

 

Summary of Method

A defined weight of pigment or extender is placed on a glass plate above which is mounted a burette containing a specified grade of linseed oil. Oil is slowly added to the sample and mixed in using a palette knife. The volume of oil required to form smooth paste is noted and the oil absorption value expressed as the number of millilitres or grams of oil required per 100 g of sample.

 

Sample Requirements

We require 100 g of sample.

 

Accreditation

Although PRA is accredited to ISO 17025 by the United Kingdom Accreditation Service (UKAS), we are not accredited to carry out this particular test.

 

Please contact Peter Collins for further details.

 

Back to Paint Testing Laboratory Page

Back to Testing Paints Prior to Application Page

Back to top of page